Modules API: fix timer example.

src/modules/hellotimer.c

@@ -30,6 +30,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#define REDISMODULE_EXPERIMENTAL_API
 #include "../redismodule.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ -41,6 +42,7 @@
 
 /* Timer callback. */
 void timerHandler(RedisModuleCtx *ctx, void *data) {
+    REDISMODULE_NOT_USED(ctx);
     printf("Fired %s!\n", data);
     RedisModule_Free(data);
 }
@@ -55,6 +57,7 @@ int TimerCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int
         char *buf = RedisModule_Alloc(256);
         snprintf(buf,256,"After %d", delay);
         RedisModuleTimerID tid = RedisModule_CreateTimer(ctx,delay,timerHandler,buf);
+        REDISMODULE_NOT_USED(tid);
     }
     return RedisModule_ReplyWithSimpleString(ctx, "OK");
 }